The File Extensions Database


.XMLX File Extension

  • Developer by: Microsoft Corporation
  • Category: Spreadsheet and workbook Files

What is an .XMLX file?

.XMLX is Excel spreadsheet

The xmlx extension is sometimes used for common Microsoft Excel xlsx spreadsheet.

Excel is a part of Microsoft Office suite for Windows and Mac.

Probably just renamed so it is not associated with Microsoft Excel by default.

This xmlx file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.


How to open:

Rename the file to XLSX and open it with Microsoft Excel.

How to convert:

Use compatible tools to export *.xmlx files to other formats.

How to solve problems with XMLX files

  • Associate the XMLX file extension with the correct application. On :
    Windows: Right click on any XMLX file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.XMLX files". Mac: Right click (or Ctrl-click) the XMLX file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .XMLX is Excel spreadsheet. Because only the current version supports the latest XMLX file format. Search, therefore, e.g. on the Microsoft Corporation manufacturer website after an available .XMLX is Excel spreadsheet update.
  • To make sure that your XMLX file is not corrupted or virus-infected, get the file again and scan it with antivirus software.